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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '009b9181cf61a9a1a45be4270d6baf55b8c10acd33c2daa07ad4990d69594cd5' 
  AND token = 'Gnd1OYYkI6zUUXrbwfeo1ftJms5RP5WyWY2s3vEhoJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}